9900111111111 has 24 divisors (see below), whose sum is σ = 15881835057360. Its totient is φ = 6092376065568.

The previous prime is 9900111111097. The next prime is 9900111111157. The reversal of 9900111111111 is 1111111110099.

It is not a de Polignac number, because 9900111111111 - 2¹⁵ = 9900111078343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

9900111111111 is a modest number, since divided by 1111111 gives 990011 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9900111111211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084820236 + ... + 1084829361.

It is an arithmetic number, because the mean of its divisors is an integer number (661743127390).

Almost surely, 2^{9900111111111} is an apocalyptic number.

9900111111111 is a deficient number, since it is larger than the sum of its proper divisors (5981723946249).

9900111111111 is a wasteful number, since it uses less digits than its factorization.

9900111111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169649632 (or 2169649613 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 27.

The spelling of 9900111111111 in words is "nine trillion, nine hundred billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".